Cider is the lowest-barrier entry point into home fermentation there is. No boiling, no grain, no mashing — just juice, yeast, and time. A one-gallon batch is a good place to start, both because it's cheap to redo if something goes wrong and because it fits in a standard glass jug.
Picking your juice
The single most important decision in the whole process. You need 100% juice with no preservatives — specifically no potassium sorbate or sodium benzoate, both of which are added to shelf-stable juice specifically to stop fermentation, which is exactly what you're trying to start. Check the ingredient label; if it just says "apple juice" or "apple juice, ascorbic acid" (vitamin C, which is fine), you're clear. Refrigerated, unfiltered juice from a grocery store or a local orchard works well and often ferments with more character than clarified, shelf-stable juice.
In practice, that means shopping in the refrigerated section near the dairy case, not the shelf-stable juice aisle. Brands like Woodchuck's plain juice base, Trader Joe's refrigerated apple cider, or whatever unfiltered jug your local orchard sells in the fall are the ones I reach for — cloudy, brown-ish, with visible sediment settling at the bottom of the jug is a good sign, not a defect. That sediment is pulp and natural pectin, and it tends to carry more of the aromatic compounds that give a fermented cider actual apple character instead of a thin, generic sweetness. Clear, filtered, pasteurized-for-shelf-life juice will still ferment, but it often finishes tasting more like fermented sugar water than cider, because a lot of what gives cider flavor gets stripped out in the filtering process that makes it shelf-stable in the first place.
If you can find a blend of apple varieties rather than a single-varietal juice, take it — commercial ciders are almost always blends for the same reason wine is blended from multiple grape lots, because different apples contribute different things (sweetness, acidity, tannin, aroma) and a blend balances those better than any single variety on its own. Read the label for a second time before you buy: some "100% juice" products still list "natural flavors" or ascorbic acid plus citric acid, both of which are fine, but a few brands sneak in potassium sorbate under a small-print ingredient list even on refrigerated juice, so don't assume refrigerated automatically means preservative-free.
Pitching yeast
Plain baker's yeast will technically ferment cider, but it produces off-flavors and stalls out at a low alcohol tolerance. A proper wine or cider yeast (Lalvin EC-1118 and Nottingham ale yeast are both common, cheap, and reliable) gives a cleaner result and finishes fermentation fully. Sanitize your jug and airlock, pour in the juice, sprinkle in the yeast, and fit the airlock. No boiling step is needed — the juice is already pasteurized.
Fermentation and sweetness
Fermentation typically runs 1–3 weeks, visible as steady airlock activity that gradually slows and stops. Standard cider yeast will ferment out nearly all the sugar, leaving a dry, still cider — closer to a light white wine than the sweet ciders sold in stores. If you want sweetness back, you have two safe options once fermentation is fully finished: add a non-fermentable sweetener like xylitol, or back-sweeten with juice and stabilize with potassium sorbate to prevent the added sugar from restarting fermentation in the bottle.
Knowing what healthy fermentation actually looks and smells like day by day saves you from panicking over normal cider behavior. Day 1: within a few hours of pitching, you should see fine bubbles clinging to the inside of the jug and a faint sulfur or bread-dough smell as the yeast wakes up — that smell fades within a day or two and isn't a problem. Days 2–4 are the most active stage: steady, frequent airlock bubbling (sometimes every second or two), visible foam or a thin cap on the surface, and a smell that shifts from bready to distinctly fruity and slightly boozy. This is peak fermentation and it's normal for it to look almost violent compared to how it started. Days 5–10, activity gradually tapers — airlock bubbles slow from every few seconds to every 30–60 seconds, the foam cap collapses, and the liquid starts to clear from the top down as yeast falls out of suspension to the bottom of the jug. By days 10–21, bubbling should be down to one every few minutes or has stopped entirely, and the cider looks noticeably clearer with a layer of sediment (the yeast, called lees) settled on the bottom.
A stalled fermentation looks different: airlock activity that goes from active to completely silent within the first 48 hours, no foam or bubbling ever really got going, or a batch that's still cloudy and sweet-tasting with zero airlock movement after a week. The most common causes are yeast that was old or improperly rehydrated, juice that was too cold when the yeast was pitched (under 60°F slows yeast way down), or a jug that got moved to a spot with big temperature swings. If you suspect a stall, first check that the airlock itself isn't just clogged or dry — a dead airlock can make an active fermentation look stalled from the outside. If it's genuinely stalled, warming the jug to the low-to-mid 60s°F and gently swirling it to rouse the yeast back into suspension often restarts things within a day. Pitching a fresh packet of yeast on top of a stalled batch is a reasonable last resort and rarely hurts anything.
Carbonation, if you want it
Still cider is bottled straight into any sealable bottle. For carbonated cider, prime with a small measured amount of sugar per bottle before capping (roughly 3/4 teaspoon per 12-ounce bottle is a common starting point) and store at room temperature for 1–2 weeks to carbonate, exactly like bottle-conditioning beer. Only carbonate cider that has fully finished fermenting and hasn't been back-sweetened with fermentable sugar — otherwise you risk overcarbonated or even exploding bottles.
Why this is a good first fermentation project
A one-gallon cider batch costs under $10 in ingredients, uses equipment you likely already have (a jug, an airlock, sanitizer), and gives you a working feel for pitching yeast, monitoring fermentation, and bottling — all skills that transfer directly to beer once you're ready to add a boil step to the process.